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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-stemmer-override-tokenfilter.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-stemmer-override-tokenfilter.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/analysis-stemmer-override-tokenfilter.html" rel="nofollow" target="_blank">../en/analysis-stemmer-override-tokenfilter.html</a></div>
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<h2 class="title">
<a id="analysis-stemmer-override-tokenfilter"></a>Stemmer override token filter<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/analysis/tokenfilters/stemmer-override-tokenfilter.asciidoc">edit</a>
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<p>Overrides stemming algorithms, by applying a custom mapping, then
protecting these terms from being modified by stemmers. Must be placed
before any stemming filters.</p>
<p>Rules are separated by <code class="literal">=&gt;</code></p>
<div class="informaltable">
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<colgroup>
<col class="col_1">
<col class="col_2">
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<th align="left" valign="top">Setting</th>
<th align="left" valign="top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p><code class="literal">rules</code></p></td>
<td align="left" valign="top"><p>A list of mapping rules to use.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">rules_path</code></p></td>
<td align="left" valign="top"><p>A path (either relative to <code class="literal">config</code> location, or
absolute) to a list of mappings.</p></td>
</tr>
</tbody>
</table>
</div>
<p>Here is an example:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT /my_index
{
    "settings": {
        "analysis" : {
            "analyzer" : {
                "my_analyzer" : {
                    "tokenizer" : "standard",
                    "filter" : ["lowercase", "custom_stems", "porter_stem"]
                }
            },
            "filter" : {
                "custom_stems" : {
                    "type" : "stemmer_override",
                    "rules_path" : "analysis/stemmer_override.txt"
                }
            }
        }
    }
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/988.console"></div>
<p>Where the file looks like:</p>
<div class="pre_wrapper lang-stemmer_override">
<pre class="programlisting prettyprint lang-stemmer_override">running =&gt; run

stemmer =&gt; stemmer</pre>
</div>
<p>You can also define the overrides rules inline:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT /my_index
{
    "settings": {
        "analysis" : {
            "analyzer" : {
                "my_analyzer" : {
                    "tokenizer" : "standard",
                    "filter" : ["lowercase", "custom_stems", "porter_stem"]
                }
            },
            "filter" : {
                "custom_stems" : {
                    "type" : "stemmer_override",
                    "rules" : [
                        "running =&gt; run",
                        "stemmer =&gt; stemmer"
                    ]
                }
            }
        }
    }
}</pre>
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<div class="console_widget" data-snippet="snippets/989.console"></div>
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